<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        li {
            width: 200px;
            height: 200px;
            margin: 20px;
            float: left;
            list-style: none;
            text-align: center;
            font: 50px/200px "simsun";
            background-color: pink;
        }
    </style>

    <script src="jquery-1.11.1.js"></script>
    <script>
        jQuery(function () {
            //设置不一样的盒子透明度逐渐递增
            $("ul li").each(function (index,element) {
                //console.log(index+"---"+element.tagName);
                $(element).css("opacity",(index+1)/10);
            });
        });
    </script>
</head>
<body>
<ul>
    <li class="aaa1">1</li>
    <li class="aaa2">2</li>
    <li class="aaa3">3</li>
    <li class="aaa4">4</li>
    <li class="aaa5">5</li>
    <li class="aaa6">6</li>
    <li class="aaa7">7</li>
    <li class="aaa8">8</li>
    <li class="aaa9">9</li>
    <li class="aaa10">10</li>
</ul>


</body>
</html>